c++ HTML URL 编码表转化

以下是使用 C++ 实现将字符串中的特殊字符转换为 HTML URL 编码的示例代码：

#include <iostream>
#include <string>
#include <sstream>
#include <iomanip>
using namespace std;

string urlEncode(const string& str) {
    ostringstream escaped;
    escaped.fill('0');
    escaped << hex;

    for (string::const_iterator it = str.begin(), end = str.end(); it != end; ++it) {
        string::value_type c = (*it);
        // Keep alphanumeric and other accepted characters intact
        if (isalnum(c) || c == '-' || c == '_' || c == '.' || c == '~') {
            escaped << c;
        }
        // Any other characters are percent-encoded
        else {
            escaped << uppercase;
            escaped << '%' << setw(2) << int((unsigned char)(c));
            escaped << nouppercase;
        }
    }

    return escaped.str();
}

int main() {
    string str = "HTML URL 编码表";
    string encodedStr = urlEncode(str);

    cout << "转换前：" << str << endl;
    cout << "转换后：" << encodedStr << endl;

    return 0;
}

输出结果：

转换前：HTML URL 编码表
转换后：HTML%20URL%20%E7%BC%96%E7%A0%81%E8%A1%A8

可以看到，特殊字符被转换为了 HTML URL 编码形式。